Sewing machine



FIG. 1 is a perspective view of the design for a sewing machine in accordance with the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear side view thereof;

FIG. 6 is a right-hand side view thereof; and,

FIG. 7 is a left-hand side view thereof. 

The ornamental design for a sewing machine, as shown. 